<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            font-style: italic;
        }
        i{
            font-style: normal;
            font-weight: bold;
        }
        b{
            font-weight: normal;
            text-transform: full-width;
            font-family: "黑体";
        }
    </style>
</head>
<body>
    <div>hello</div>
    <i>world</i>
    <b>hello HELLO</b>
</body>
</html>